Spot Bitcoin ETFs lead globally in AUM and inflows, holding ~6% of BTC supply (~1.28M BTC, valued ~$88B total across U.S. funds as of March 3, 2026). BlackRock and Fidelity dominate.
iShares Bitcoin Trust (IBIT) — BlackRock: Largest by far, ~$50–$70B+ AUM (often cited as the fastest-growing ETF ever).
Fidelity Wise Origin Bitcoin Fund (FBTC): ~$13–$18B AUM.
Grayscale Bitcoin Mini Trust (BTC): Lower fees (0.15%), ~$3–$4B+ AUM.
Ethereum ETFs (e.g., iShares Ethereum Trust) follow at ~$6B+ combined.
Broader/multi-crypto options like Grayscale CoinDesk Crypto 5 ETF (GDLC) exist but are smaller.
